Transmission mechanism



May 3U, 1950 c. A. TEA 2,509,997

TRANSMISSION MECHANISM Filed Sept. 5, 1946 3 sheets-sheet l /f /0 f f@|l 2,? /ff i l z f T-I l \L f-M' l E l /9 l f/' Z2 .III l/ l k1 (32 IlIl Il l l l 32 L I-r;

IN V EN TOR.,

' L Y 7% z; 77:44, BY r May 30,. 1950 c. A. TEA 2,509,99'@

TRANSMISSION MECHANISM File Sept. 3, 1946 3 Sheets-Sheet 2 /4f IINVENTOR. /Mz 4 y/ H. 72d. n By C. A. TEA

TRANSMISSION MECHANISM 3 Sheets-Sheet 3 May 30, 1950 Filed Sept. 3, 1946Patented May 30, 1950 UNITED STATES PATEN T 0F F ICE 2,509,997TRANSMISSION MECHANI'SM Cark` A. Tea, Detroit, Michi., assigner to TheMurray Corporation of America, Detroit, Mich., a, corporation of`Delaware Application September 3, 1946, SeriafNo. 694,617

(CL M -63).

15` Claims.

This invention relates to. transmissions and particularly to atransmission for a washing machine and the like.

Thetransmission of the present invention per-- tains particularly to onefor operating a washing machine.V having a rotor' driven continuously inrotation and a squeezebar operated in rotation along therewith andf inoscillation relative thereto. A washing machine for which the presenttransmission mechanism was invented is similar tothatillustrated,described andA claimed in the co-pending application of A. H.Haberstuinp, Serial No. 666,706, filed May 2, 1946, and assigned to theassignee of the present invention.

The Washing machine comprises `a cabinet or supporting legs on which acylindricalitub is mounted with its axis. disposed horizontally. Withinthettubr a rotor is mounted having its axis coinciding with that oftheVtub. Centrally of the rotor and tub, a shaft is provided. on the end. ofwhich a squeeze. bar is supported for rotation with the rotor andoscillation relative thereto. forv squeezing the clothes durimg.` thewashing, rinsing and drying cycles.

The transmission mechanism is of. the-constant speed type, the washingmachine operating at the same speed` throughout the washing, rinsingand` drying cycles. A housing issupported on the` rear wall of thetuhhavins journaled therein a hollow shaft with; a. gear secured.tlzleren to. The gear is driven from a pinion `mounted on a shaft whichalso has.; a iivwheelA and; pulley secured theretov exteriorly of theAhousing. The pulley is: connected by a` beltA toJ a.Y pulley on. the

motor for driving the shaft, pinion. and iiywheel for rotating the gear,the hollow shaft, and; the rotor` which is supportedthereon. A. secondshaft is,` journaled within; the hollow shaft for sup,- porting` thesqueeze bar within the rotor. The shaft is provided with a cylindricalcamy having its aX-S offset from that of the shaft and having meansthereon for supporting oneend of a spring, theopposite end of which isconnected to the gear which drives the hollow shaft. One end of theSpring is carried around by the driving gear so that the squeeze barshaft is carriedl along therewith to have the squeeze bar and rotordriven in rotation while permitting relative oscillating movementtherebetween.

For producing the relative oscillating move ment between the central andhollow shaft,` that is tosay, between the rotor and the squeeze bar; aconnecting rod is applied to the cani` on the central shaft, havingr theopposite end connected to. apiston which reciprocates within an open 55ended cylinder havingV the closed end' pivotal-ly mounted within thehousing. Oil or likeilu-id is disposed within the housing above thecylinder and pressure and reliefports` areV provided through thepis-ton. Ven-ts are-provided in the piston and cylinder which areopenenA and ciosed'- by a portieri` of# the `piston wall-for controllingthe duration of maximum pressure applied 'through the pis-ton andconnectingrodto `the squeeze bar. The piston operating Within the`cylinder interrupts the drivingr of the squeeze bar relative tothedriving of the rotor: A shoulder extending `inwardly from theperipheralL Wall `will ad- Vance and carry-a portion ofthe fabricswithin the rotor against the squeeze bar with a predetermined pressure'and for a` predetermined l'engtl-iof` arcuatetra-vel of therotor.Thereafter, the pressure within the cylinder is relieved" by the passageof` the portion ofthe wallo the piston beyond ar'elie port therein`whichrelieves the cam1 and. squeeze bar shaftrfromanyfurther pressure sothat the spring connected between theshart and gear is free to returnthe squeeze barto` its originale position spaced from' the shoulderwithin the rotor to continue to rotate with the rotory in spacedrela-tion? witht-he shoutder. A suitable buirer may be provided betweenthe i'fvvo` shafts for limiting the shockat the end of the separatingmovement between the rotor shoulder and squeeze bar;

According-1y, the' main objects of the invention are; to provide atransmission mechanism of simple construction which rotates a rotor anda squeeze barsimultaneouslyandfin oscillation-relative to each other; toprovide ag transmission mechanism having telescopedv shaftsinterconnected by a spring so as to' be simultaneously rotated when oneofthe shafts is driven and` to be relatively oscillated when the othershaft has a braking load' appliedA thereto; tolprovide atransmissionmechanism havinga, pair of spring connected telescopedshafts, one, of which, is driven, the other of which has` a` cam. fordriving a pitman at one point in the, reciprocation of which aresistance is appliedA which interrupts the simultaneous rotation ofz`the shafts to pito duceA a relativeoscillationtherebetween; and; ingeneral, to provide atransmission which isisirnple in construction,positive in: operation and.` eco nomical of manufacture.

@ther objects and features of novelty of the invention will bespecifically pointed out or will become apparent when referring, for a`better understanding of the invention;v to the` `foliovving descriptiontaken in conjunction with the accompanying drawings, therein:

Figure 1 is a broken view in side elevation, with parts in section, of awashing machine having a transmission mechanism thereon embodyingfeatures of this invention;

Fig. 2 is an enlarged sectional view of the structure illustrated inFig. 1, taken on the line 2-2 thereof;

Fig. 3 is a sectional view of the structure illustrated in Fig. 2, takenon the line 3-3 thereof;

Fig. 4 is a sectional view of the structure illustrated in Fig. 2, takenon the line 1 -l thereof;

Fig. 5 is a broken front view, with parts in section, of the Washingmachine illustrated in Fig. l,

and

Fig. 6 is an enlarged broken view of a portion of the structureillustrated in Fig. 4.

Referring more particularly to Figs. 1 and 5, the transmission mechanismof the present invention is illustrated as being applied to a Washingmachine which embodies a cabinet lo having a tub Il mounted therein withits axis disposed horizontally. A housing l2 of the transmission issecured to the rear wall of the tub H by suitable means hereinillustrated as by a plurality of screws. Projecting from the rear faceof the housing is a hollow shaft I3 in which a central shaft I4 isjournaled. A rotor l5, in which the fabrics are washed, is mounted onthe hollow shaft I3 by a spline or key connection I6, While an arm Il of`a squeeze bar I8 is secured to the end of a central shaft ld through aspline connection i9 by an end screw 2l extending through an end cap 22.The peripheral wall 23 of the rotor l5 is provided with an inwardlyprojecting shoulder 2d extending between the end walls thereof, havinganges 25 projecting inwardly toward each other for engaging andsupporting a resili ent squeeze element 26. Spaced plates 2l aredisposed within the squeeze area between the squeeze bar and squeezeelement 26 in which the water squeezed from the fabrics may pass fromthe rotor into the tub. The squeeze bar I8 in a similar manner has aresilient squeeze element 2Q thereon which is positioned to engage thefabrics and press them against the squeeze element 26. The squeezeelements 26 and 29 are so located as to have the outer` ends engage eachother as at 3| to force the water being squeezed from the fabricsdownwardly to the passageways between the plates 2l. The face of one orboth of the squeeze elements may be provided with a plurality ofrecesses 32 for receiving the water being squeezed from the fabricswhich will pass downwardly therein and through the passageway 2l betweenthe plates.

rThe front face of the cabinet i is provided with a door which has, whenclosed, a sealing relation with an opening in the tub which is alignedwith an opening in the rotor. When the door is opened, the fabrics maybe passed through the opening in the tub into the rotor, after which thedoor is closed in sealing relation with the opening in the tub toprevent the water from being splashed therefrom during the cycles ofoperation on the fabrics.

Referring more particularly to Figs. 2, 3 and 4, the transmissionmechanism embodies a gear 3l which is a part of, or which may beremovably secured to, the hollow shaft i3. The teeth of the gear 3lengage the teeth of a pinion 38, the shaft lli of which is mounted on aneedle bearing t@ and a roller bearing lll on opposite walls of thehousing in sealed relation thereto by a sealing ring 42. rEhe hub e3 ofthe pulley and ywheel is secured to the projecting end of the pinionshaft l'l, being secured thereto by a key t5 which is retained inposition by a setscrew 46. The gear 3l has a ledge @l extending from oneof the spokes thereof, having threaded or otherwise secured thereon aplunger ri. The gear 31 is also provided with a boss de having a notchedpin 5E! projecting therefrom for receiving one end of a coil spring 5|.

The shaft Eri is journaled within the hollow shaft i3 on bearings 52 andis also provided with an outboard needle bearing 53 journaled in a boss5fl on the removable cover 55 of the housing i2. A circular cam 5S isprovided on the shaft It having its center offset from the center of theshaft. A connecting rod 51 has a ring 53 secured over the cam 55 and hasa projecting arm portion 59 which is threaded to receive the threadedend of the rod El which has on the end thereof a piston 52. Plates 6i)and 63 are secured to the circular cam 56 by suitable means, hereinillustrated as by rivets '54, to retain the ring 58 of the connectingrod 5; aligned therewith. The plate 63 has a projecting finger t5flanged outwardly at 66 for receiving the opposite end of the spring 5l.Diametrically opposite to the nger S5, a flange 66 projects from theplate 63 on which a buer element 69 is secured. The buffer elementembodies a cylinder ll having a stud 'l2 extending therefrom and throughan aperture in the flange 68 to which it is secured by a nut lf3.

A resilient annular element lll is retained within the cylinder ll bythe inturned flange 16 about the outer edge of the cylinder. Arestricted aperture il is formed by the resilient element 14 whichproduces a buing action when the buiiing element is moved over theplunger i8, which occurs when the squeeze bar I3 is separated from theshoulder 24 of the rotor. This cushions the squeeze bar at the end ofits opening movement and eliminates the shock and bounce which wouldotherwise occur thereto.

It is to be understood that during the operation of the machine thebilling element 69 will be immersed in the oil within the housing, andthe restriction to the escape of this oil produced by the projection ofthe plunger i3 into the element lil produces the complete bufng of thesqueeze bar at the end of its opening movement. rIhis opening movementis produced by the tension in the spring 5l after the squeeze operationof the squeeze bar upon the fabrics within the rotor.

The piston 52 operates within a cylinder 18 having on the bottom closedend a bearing ring H9 which oscillates on a stub shaft ill, one end ofwhich is secured to the housing and the opposite end of which is securedto the cover 55. The cylinder is provided with a plurality of orifices82 medially of its ends in alignment with orices 33 through the wall ofthe piston when the piston is approximately at the end of its downwardstroke. The piston 52 has a head thi, provided with a central openingfor receiving the end of the rod 6i on which it is secured by a nut 85.The head 8d is provided with a plurality of small apertures S6 annularlydisposed about the center of the head to be covered by one or more thindisks 8l which prevent the flow of fluid through the apertures until apredetermined pressure has been attained. A cylindrical sleeve 8Sextends downwardly from the head Si having an upper area 89 inengagement with the wall of the cylinder i5 and asimilar areaal at thevbottom in contact with the cylinder wall.

Referring to Fig. 6,` it will be noted that the area 3| has a centralportion B2 in direct en- `sagement with the cylinder wall 'I8 andsloping areas 93; above and below the area 92 which cushions the closingor opening of the orices 82 as the central portion 92 of the area 9|moves thereover. This eliminates the sudden opening and closing of theorifices and retards the building` up.` or relieving of the pressurebefore and after a maximum pressure is reached. A spaced ring 9.4` orseparate bale platesmay be provided about the outer wall of the cylinder18, spaced from `the orifices 82, for deecting the oil passingtherethrough under pressure and preventing the` creation of a whistlingsound which would otherwise occur each time the oil is forced throughthe orices.

A boss 95 is provided at the top of the housing I2 to,Y form a llpassageway through which oil is introduced in the housing and which isclosed by `a plug S5. A drain plug 91 is provided in the housing forregulating the height of oil therewithin. A ball bearing 98 is mountedbetween the hollow shaft` I3 and the housing I2 and a s eal 99Y isprovided between the shaft and the housing outwardly of the ball bearingand also between the shaft I3 and the central shaft I4.

Thrust washers IUI, |02 and |53 are provided between the rotor hub` andthe housing I2, between the end of the hollow shaft and the plate 6.3,and between the plate 60 and the cover 55, respectively. The needlebearing 53 is mounted in a` sealing c ap 294 which seals the end of theshaft I4 in the` end of the cover 55 of the housing. Thev hub 43supportsthe pulley |05 which is formed thereon in unit relation with aflywheel |66; The pulley is driven by a belt I 0'| from a motor |03. Theflywheel stores up energy durf ing the rotation, which is expendedduring the squeezing of the fabrics between the squeeze bar and theshoulder of the rotor.

In operation, the motor drives the shaft it which drives the. pinion `38and the gear 57 for rotating. the hollow shaft I3 and rotor I5 directlytherewith. The spring 5|,` carries the shaft I4 and squeeze bar inrotation along with the ro tationof the shaft I3.` and rotor, when thesqueeze bar is separated from the shoulder 2,4 of the rotor and thebuffing element 69 is in contact with .the plunger 4.8. The rotation ofthe shaft I4 produces a revolution of the cam 56 about theshaft center,with the resulting reciprocation of the piston 52 within the cylinder'I8 once during each rotation of the rotor. As the piston is moveddownwardly within the cylinder 18, the area` 9| at the bottom of thepiston rst closes the orifices 32, which traps the oil within the pistonin the lower portion of the cylinder and o iers resistance to thedownward movement of the piston, so that a pressure builds up opposingthe rotation of the shaft I4. The movement of the shaft I4 in rotationwith the rotor is interrupted so that the shoulder on the rotoradvarices toward the squeeze bar on the shaft I 4. When the squeezeelements 26 and 29 engage each other or engage the fabric disposedtherebetween so that no further relative movement can` occur between theelements, the pressure will build up to a maximum amount within thepiston and cylinder, regulated by the disks 81 or other valving means,so that a maximum pressure will be applied to the fabrics squeezedbetween the elements 2 6` and 25 irrespective of whether a 6i. large orsmall amount 0f the fabrics are beine squeezed- The pressure ismaintained upon the fabrics until the area 9| has passed downwardly overthe orifices 82, after which the tension in the spring 5| moves thesqueeze bar awayfrom the shoulder to open position, with the finalopening movement cushioned by the projection of the plunger 4S withinthe buiiing element 69.

The arm 59, and the rod 6I have an :aperture |09 extending therethroughcommunicating with a channel recess III provided in the ring 58 of the`connecting rod 5,1. The ring 58 and the circular earn` are lubricatedunder pressure by the oil passing through the passageway IIIIB fromwithin the piston E2 to the channel recess to be indirect contact withthe peripheral. face of the circular cam 56.. The spring 5| issufficiently strong to` rotate the circular cam 5B to. retract thepiston 62 from within the cylinder 18 to thereby separate the squeezebar I8. away from the squeeze element 25; immediately after the squeezeoperation upon the fabrics, that is to say, after the area 9| has passeddownwardly over the orinces 82. The movement of the squeeze bar i8 toits position spaced from the squeeze element 25 is cushioned bythe buierelement 69 passing over the plunger d8, as pointed out. hereinabove. Themaximum pressure produced by the operation of the piston 62 within thecylinder 7S. occurs over a short arc of rotation of the rotor, theentire build-up and relief of the pressure consuming approximately 15 ofeach complete rotation of the rotor.

It will be noted that, with this construction, a maximum pressure isapplied to the fabrics irrespective of the amount of fabrics beingsqueezed between the squeeze elements 25. and 29.

Squeeze elementsforce the water through the fabrics during the washingand rinsing cycles to..

iiush out the embedded particles and to extract the major portion of thewater therefrom during the drying cycle. The complete automaticoperation of the machine follows that illustrated, described. in detail,and claimed in the abovementioned copending application of Alfred H.Haberstump.

Shouldthe machine be stopped during the time the fabrics are beingsqueezed, the pressure on the oili would be soon relieved, permittingthe spring 5i. to separate the shoulder and squeeze bar, therebyreleasing the fabrics. While in the present construction the spring 5|is of sufcient strength to retain the squeeze bar spacedv from theshoulderv when the area 9| of the pistons a passesupwardly over theorifices 82, it is within the purview of the invention to provide arelief valve on the piston or cylinder to admit oil into the latter onthe upstroke of the former.

What is claimed is:

1. In a transmission mechanism, a rotatable hollow shaft, a second shaftrotatable within said first shaft, means for drivingsaid first shaft inrotation, a pitman operated by said second shaft having a piston on theend` thereof, a `iiexible drive connection between said driving meansand said second shaft, a cylinder in which said piston reciprocates, anda` liquid within said piss ton and cylinder for applying a resistance tosaid pitman at a predetermined point in the cycle of reciprocationbetween said piston and cylinder.

2. In a` transmission mechanism,` a rotatable hollow shaft, a secondshaft rotatable within said first shaft, means for driving said firstshaft in rotation, a pitman operated by said second shaft` having apiston on the` end thereof,` a iiexf ible drive connection between saiddriving means and said second shaft, a cylinder in which said pistonreciprocates, a liquid within said piston and cylinder for applying aresistance to said pitman at a predetermined point in the cycle ofreciprocation between said piston and cylinder, and pressure reliefmeans associated with the liquid within said piston and cylinder forlimiting the resistance produced thereby.

3. In a transmission mechanism, a rotatable hollow shaft, a second shaftrotatable within said first shaft, means for driving said first shaft inrotation, a pitman operated by said second shaft having a piston on theend thereof, a cylinder in which said piston reciprocates, a liquidwithin said :piston and cylinder for applying a resistance to saidpitman at a predetermined point in the cycle of reciprocation betweensaid piston and cylinder, pressure relief means associated with theliquid within said piston and cylinder for limiting the resistanceproduced thereby, and spring means connected between said shafts forproducing simultaneous rotation thereof through the driving of the firstsaid shaft while permitting oscillation therebetween when pressure isapplied to the second said shaft by the resistance on said pitman.

4. In a transmission mechanism, a rotatable hollow shaft, a second shaftrotatable within said first shaft, means for driving said first shaft inrotation, a pitman operated by said second shaft having a piston on theend thereof a cylinder in which said piston reciprocates, a liquidwithin said piston and cylinder for applying a resistance to said pitmanat a predetermined point in the cycle of reciprocation between saidpiston and cylinder, pressure relief means associated with the liquidwithin said piston and cylinder for limiting the resistance producedthereby, spring means connected between said shafts for producingsimultaneous rotation thereof through the driving of the first saidshaft while permitting oscillation therebetween when pressure is appliedto the second said shaft by said pitman, and a flywheel driven by theresistance on said driving means.

5. In a transmission, a housing, a hollow shaft, bearing means forsupporting said shaft within said housing, a shaft journaled within saidhollow shaft, a gear for driving said hollow shaft, a pinion on a shaftjournaled in said housing for driving said gear, a pulley and flywheelon said pinion shaft, a piston on the end of the pitman, an oscillatablecylinder in which said piston reciprocates, a liquid within said housingcovering said piston and cylinder, orifices through the walls of thecylinder and piston for lporting the liquid therethrough, and aprojection on said piston for covering and uncovering the orificesthrough said cylinder for building up a resistance on said pitman at apredetermined point in the pistons reciprocation.

6. In a transmission, a housing, a hollow shaft, bearing means forsupporting said shaft within said housing, a shaft journaled within saidhollow shaft, a gear for driving said hollow shaft, a pinion on a shaftjournaled in said housing for driving said gear, a pulley and flywheelon said pinion shaft, a pitman operated by said Second shaft, a pistonon the end of the pitman, an oscillatable cylinder in which said pistonreciprocates, a liquid within said housing -covering said piston andcylinder, orifices through the walls of the cylinder and piston forporting the liquid therethrough, a projection on said piston forcovering and uncovering the orices through said cylinder for building upa resistance 0n said pitman at a predetermined point in the pistonsreciprocation, said projection being slightly ta.- pered at least at oneedge for cushioning the closing and opening of said orifices.

'7. In a transmission, a housing, a hollow shaft, bearing means forsupporting said shaft within said housing, a shaft journaled within saidhollow shaft, a gear for driving said hollow shaft, a pinion on a shaftjournaled in said housing for driving said gear, a pulley and flywheelon said pinion shaft, a pitman operated by said second shaft, a pistonon the end of the pitman, an cscillatable cylinder in which said pistonreciprocates, a liquid within said housing covering said piston andcylinder, orifices through the walls of the cylinder and piston forporting the liquid therethrough, a projection on said piston forcovering and uncovering the orifices through said cylinder for buildingup a resistance on said pitman at a predetermined point in the pistonsreciprocation, said projection being slightly tapered at least at oneedge for cushioning the closing and opening of said orifices, andpressure relief means provided for the liquid within the piston andcylinder for limiting the resistance built up thereon.

8. In a transmission, a housing, a hollow shaft, bearing means forsupporting said shaft within said housing, a shaft journaled within saidhollow shaft, a gear for driving said hollow shaft, a pinion on a shaftjournaled in said housing for driving said gear, a pulley and flywheelon said pinion shaft, a pitman operated by said second shaft, a pistonon the end of the pitman, an oscillatable cylinder in which said pistonreciprocates, a liquid within said housing covering said piston andcylinder, orifices through the walls of the cylinder and piston forporting the liquid therethrough, a projection on said piston forcovering and uncovering the orifices through said cylinder for buildingup a resistance on said pitman at a predetermined point in the pistonsreciprocation, said projection being slightly tapered at least at oneedge for cushioning the closing and opening of said orifices, :pressurerelief means provided for the liquid within the piston and cylinder forlimiting the resistance built up thereon, and buffer means disposedbetween said two shafts in engagement when in simultaneous drivingrelation with each other for cushioning the shock otherwise produced atthe end of the relative oscillation between the two shafts.

9. In a transmission, a housing, a hollow shaft, bearing means forsupporting said shaft within said housing, a shaft journaled within saidhollow shaft, a gear for driving said hollow shaft, a pinion on a shaftjournaled in said housing from driving said gear, a pulley and fiywheelon said pinion shaft, a pitman operated by said second shaft, a pistonon the end of the pitman, an oscillatable cylinder in which said pistonreciprocates, a liquid within said housing covering said piston andcylinder, orifices through the walls of the cylinder and piston forporting the liquid therethrough, a projection on said piston forcovering and uncovering the orifices through said cylinder for buildingup resistance on said pitman at a predetermined point in the pistonsreciprocation, said projection being slightly tapered at least at oneedge for cushioning the closing and opening of said orifices, pressurere- ?5 lief means provided for the liquid within the piston and cylinderfor limiting the resistance built up thereon, buffer means disposedbetween said two shafts in engagement when in simultaneous drivingrelation with each other for cushioning the shock otherwise produced atthe end of the relative oscillation between the two shafts, and springmeans interconnecting said two shafts which produce a simultaneousdriving of the shafts through the driving of the hollow shaft andpermits the relative oscillating movement therebetween.

10. In a transmission, a housing, a hollov.7 shaft, bearing means forsupporting the hollow shaft in said housing, a gear for driving saidhollow shaft, a pinion for driving said gear, a second shaft journaledwithin said hollow shaft, spring means interconnecting the two shaftsfor producing the simultaneous driving thereof while permitting relativeoscillation therebetween, an eccentric on said second shaft, a pitmanhaving a bearing strap encompassing said eccentric, and means forapplying a predetermined resistance on said pitman at a predeterminedpoint in its movement.

1l. In a transmission, a housing, a hollow shaft, bearing means forsupporting the hollow shaft in said housing, a gear for driving saidhollow shaft, a pinion for driving said gear, a second shaft journaledwithin said hollow shaft, spring means interconnecting the two shaftsfor producing the simultaneous driving thereof While permitting relativeoscillation therebetween, an eccentric on said second shaft, a pitmanhaving a bearing strap encompassing said eccentric, a piston on saidpitman, an oscillatahle cylinder in which said piston reciprocates,orifices extending through the walls of the piston and cylinder, and anannular projection on the wall of the piston for covering and uncoveringthe orifices in the cylinder wall for producing a resistance on thepitman at a predetermined point in the recprocation of the piston.

12. In a transmission, a housing, a hollow shaft, bearing means forsupporting the hollow shaft in said housing, a gear for driving saidhollow shaft, a piniony for driving said gear, a second shaft journaledwithin said hollow shaft, spring means interconnecting the two shaftsfor producing the simultaneous driving thereof while permitting relativeoscillation therebetween, an eccentric on said second shaft, a pitmanhaving a bearing strap encompassing said eccentric, a piston on saidpitman, an oscillatable cylinder in which said piston r-eciprocates,orifices extending through the walls of the piston and cylinder, aprojection on the wall of the piston for covering and uncovering theorifices in the cylinder wall for producing a resistance on the pitmanat a predetermined point in the reciprocation of the piston, and meansin communication with the liquid in the piston and cylinder for limitingthe resistance to the piston movement.

13. In a transmission mechanism, a housing, a hollow shaft, bearingmeans for supporting the hollow shaft in said housing, a gear fordriving said hollow shaft, a pinion for driving said gear, a secondshaft journaled within said hollow shaft, spring means interconnectingthe two shafts for producing the simultaneous driving thereof whilepermitting relative oscillation therebetween, an eccentric on saidsecond shaft, a pitman having a bearing strap encompassing saideccentric, means for applying a predetermined resistance to said pitmanat a predetermined point in its movement, said means embodying a pistonand cylinder operating within oil contained within said housing, saidpitman having a passageway therethrough for admitting oil under pressurefrom said cylinder to said eccentric surface for lubricating saidsurface.

14. In a transmission mechanism, a housing, a hollow shaft, bearingmeans for supporting the hollow shaft in said housing, a gear fordriving said hollow shaft, a pinion for driving said gear, a secondshaft journaled within said hollow shaft, spring means interconnectingthe two shafts for producing the simultaneous driving thereof whilepermitting relative oscillation therebetween, an eccentric on saidsecond shaft, a pitman ,having a bearing strap encompassing saideccentric, means in the path of movement of said pitman to provide aresistance to such movement, and bung means for cushioning the twoshafts after relative movement in oscillation occurs therebetween.

15. In a transmission mechanism, a housing, a hollow shaft, bearingmeans for supporting the hollow shaft in said housing, a gear f'ordriving said hollow shaft, a pinion for driving said gear, a secondshaft journaled within said hollow shaft, spring means interconnectingthe two shafts for producing the simultaneous driving thereof whilepermitting relative oscillation therebetween, an eccentric on saidsecond shaft, a pitman having a bearing strap encompassing saideccentric, means in the path of movement of said pitman to provide aresistance to such movement, and bufling means for cushioning the twoshafts after relative movement in oscillation occurs therebetween, saidbuing means embodying a cuplike element having an inner resilientsurface and a plunger projectable therein, the element and plunger beingcarried by the two shafts, respectively.

CLARK A. TEA.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 14,352 Everett Mar. 4, 1856227,967 Downing May 25, 1880 708,455 Blake Sept. 2, 1902 1,133,992Mayelds Mar. 30, 1915 1,936,853 Ofeldt Nov. 28, 1933 2,073,866 EdwardsMar. 16, 1937

